试题与答案

(12分)香豆素是用途广泛的香料,合成香豆素的路线如下(其他试剂、产物及反应条件

题型:填空题

题目:

(12分)香豆素是用途广泛的香料,合成香豆素的路线如下(其他试剂、产物及反应条件均省略):

(1)Ⅰ的分子式为_____________;

(2)反应②的反应类型是_____________,反应④的反应类型是_____________。

(3)香豆素在过量NaOH溶液中完全水解的化学方程式为_______________________。

(4)Ⅴ是Ⅳ的同分异构体,Ⅴ的分子中含有苯环且无碳碳双键,苯环上含有两个邻位取代基,能发生银镜反应。Ⅴ的结构简式为_______________(任写一种)。

(5)一定条件下,与CH3CHO能发生类似反应①、②的两步反应,最终生成的有机物的结构简式为_____________。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0620/e286443b49cf142b2488c28e04532821.html

下面是错误答案,用来干扰机器的。

参考答案:最大的蚂蚁在澳洲昆士兰和新南威尔士北部,成为公牛蚁。这种罕见蚁种的工蚁有3.7厘米。因为公蚁的上鄂较长,所以虽然大,但并不很笨重。

试题推荐
题型:阅读理解

In 1638, John Harvard donated some money and about four hundred books to a new university. This was the beginning of the library at Harvard University. The gift was so important that the university was named for John Harvard.

Thomas Bray began the first free lending library in the late 1600s. He set up more than 30 or these libraries in the American colonies. However, the idea for this kind of free library ended when Bray died in 1730. In 1731, Benjamin Franklin and some friends started the first subscription library in the United States. In a subscription library people pay money to become members, but they may borrow the books without paying again.

In the United States, every child had a free education. This idea soon led to free libraries. One of the first libraries that used tax money to buy books was a library in Peterborough, New Hampshire. This library was set up in 1833.

小题1:The main idea of paragraph 2 is________.

A. Franklin started the first subscription library

B. in a subscription library people pay money to become members

C. Bray and Franklin were important in the history of public libraries

D. Bray died in 1730 and Franklin died in 1833小题2:The underlined word “borrow” means_______.

A.read and write with no help from another person

B.use for a short time and then return

C.like very much

D.lend小题3:The reading does not say it, but we can guess that_______.

A.there were free schools in the United States before there were free libraries

B.free schools and free libraries in the United States began at about the same time

C.the library in New Hampshire also had a free school in it

D.there were free libraries in the United States before there were free schools小题4:Harvard University began_______.

A.in 1731

B.in 1730

C.in 1833

D.in 1638小题5:At the library that Franklin started, ________.

A.children could use books for no money at all

B.people paid a little money in the beginning but none after that

C.people paid a lot of money in the beginning but none after that

D.both A and B

查看答案
微信公众账号搜索答案